Benchmark and results of Time.new.to_i versus java.lang.System.nanoTime called from JRuby.

a

Calculating -------------------------------------
       Time.new.to_i    106740 i/100ms
     System.nanoTime    187876 i/100ms
-------------------------------------------------
       Time.new.to_i  5457230.7 (±7.3%) i/s -   27111960 in   5.000000s
     System.nanoTime 17952011.5 (±9.2%) i/s -   88301720 in   4.976000s

bench_clock.rb

require 'benchmark/ips'

java_import java.lang.System

Benchmark.ips do |bm|
  bm.report('Time.new.to_i') do |n|
    while n > 0
      Time.new.to_i
      n-=1
    end
  end

  bm.report('System.nanoTime') do |n|
    while n > 0
      System.nano_time
      n-=1
    end
  end
end